sixth-rate

Short definition from Wiktionary

Adjective

1. 1
   Of a Royal Navy warship in the Napoleonic Era: having 20–28 guns on one gun deck, a complement of 140–200, and weighing 340–550 tons burthen.
2. 2
   Terrible, awful; less than fifth-rate.
3. 3
   Alternative spelling of sixth-rate.

Noun

1. 1
   A sixth-rate warship.
2. 2
   Alternative spelling of sixth-rate.